Evaporator structure



April 3, `1934.

Blk

F. G. sLAGEL 1,953,269

EVAPORATOR STRUCTURE Filed Dec. 31, 1931 Patented `pr'.. 3, 193i I Franklin 1G. Slagel, Bunialo, N. if., assigner to Fedders Manufacturing Company, line., Buffalo, N. ll., acorporation of New ilorlr Application December 3l, ll93l, Serial No. 584,212

2 Claims This invention relates to mechanical refrigerating systems and more particularly to evaporatorl structures.

In order to speed up the transfer of heat from food and liquids stored in evaporators,l it has been proposed to form and connect shelves with the evaporators so, that refrigerant circulating in the evaporator iiows through the shelves.

An object of this invention is to provide a new and novel form of refrigerated evaporator shelf.

Another object of the invention is to provide a shelf for evaporators which has conduit or duct means associated intimately therewith and connected with the evaporator refrigerant circuit so that refrigerant flows therethrough.

A further object of the invention is to provide a refrigerated form of shelf for evaporators which can be cheaply manufactured and installed.

Other objects of the invention will` appear from the following description taken in connection with the drawing, which forms a part of the specification, and in which:

Fig. 1 is a perspective view of an evaporator having a refrigerated shelf incorporating my invention associated therewith.

Fig. 2 is a plan view of the shelf removed from the evaporator.

Fig. 3 is a side elevation of the shelf.

' Fig. 4 is a sectional view of the shelf taken on line 4 4 of Fig. 2.

Fig. 5 is a sectional view of the shelf taken on line 5-5 of Fig. 2.

Fig. 6 is a sectional view of the shelf taken on line 6-6 of Fig. 2.

Referring now to the drawing by characters of reference, 10 indicates generally a flooded type of evaporator adapted to be connected in circuit with a conventional form of compressor and condenser. The illustrated evaporator consists of a header 11 and a storage chamber housing formed of two sheets of metal l2 and 13. The outer sheet is formed with parallel pressed out bosses 14 which with the associated sheet form a plurality of conduits or duct means encircling the storage chamber and communicating with the interior of the header; 'Ihe ends of the sheets are welded together'as indicated at l5 and the adjacent edges of the sheets are welded together, as indicated at 16. The sheets are also Welded together intermediate the bosses, and the upper ends of the bosses are secured to the header. The header is of conventional design and can be connected in the refrigerating system in the usual manner by means of an inlet connection 1'? and an outlet connection 18.

overlying side portions thereof are turned down thereby serving to strengthen the unit and to cover the edges. The tcp sheet is also formed with rails 2 3 which are pressed upwardly in parallel relation to serve as bearing surfaces for receptacles inserted into the storage chamber of the housing.

Extending across each end portion of the shelf is a manifold-or header 24, such manifolds being formed partly by the upper and lower sheets of metal. Connecting the manifolds are ducts 25 75 which extend in parallel relation longitudinally of the shelf. To form these ducts the lower sheet is formed with depressed spaced ribs 26 terminating transversely extending ribs 27 which form the lower part of the manifolds. per sheet is substantially flat, except for the rails, the side iianges and semi-circular extensions 28 which form a continuation of the manifolds. Such extensions are formed semi-circular and mate with extended portions 29 of the lower lSri sheet, there being flange portions 40 suitably secured together. The extreme ends of the semicircular extensions terminate in vertically extending flanges 30. Between the rails and beyond the manifolds, the sheets are Welded together as indicated at 31, thus sealing the refrigerant duct means formedby the manifolds and the ducts connecting the same.

The front and the rear evaporator conduit loops 14 are formed lopenings around which the 95 flanges-30 are arranged and secured to the chamber wall by welding or some other similar method. The evaporator is preferably of the flooded type and the conduits 14 are 'thus filled with refrigerant at all times. open communication with the end conduits, they and the connecting ducts 25 therebetween will also be filled with refrigerant. Refrigerant flows into the header through the connection 17 and refrigerant gas escapes through the connection 18, suitable automatic control mechanism of a conventional'type being utilized Within the header to maintain a constant quantity jof refrigerant in the header.

It be seen that the shelf headers com- The top sheet is 60 As the manifolds are in 100 municate with the refrigerant in the duct means encircling the evaporator chamber and that refrigerant in the shelf headers can flow from one to the other through the parallel duct means in the shelf. The refrigerant will circulate freely through the shelf and thus a low shelf temperature maintained so that quick freezing of liquids supported thereon will take place. As

the shelf consists of only two sheets of metal, it

can he cheaply manufactured.

Although the invention has been described in connection with certain specific embodiments the principles involved are susceptible of numerous other applications which will readily occur to persons skilled in the art, and the inven tion is therefore to be limited only as indicated 'by the scope of the appended claims. y

What I claimis:

1. A shelf for refrigeration evaporators, comprising a pair of superimposed sheets of metal, the lower of said sheets being formed with a transverse depending rib adjacent its transverse marmesas@ said ribs forming spaced header portions between said sheets open at opposite ends, said lower sheet being also formed with a plurality of longitudinally extending depending portions forming ducts between said sheets for connecting' said headers, means securing said sheets, and flange means at opposite ends of said headers, each adapted for connection with an evaporator,

2. A shelf for refrigeration evaporators, com- `prising a pair of superimposed sheets of metal, 

